用JS判断当前显示器的分辨率?

ajax

<link rel="stylesheet" type="text/css" id="css">
<script language="javascript">
function dis()
{
    if((screen.width == 1024) && (screen.height == 768))
    {
        document.getElementById('css').href = '2.css';
    }else if ((screen.width == 800) && (screen.height == 600))
    {
        document.getElementById('css').href = '1.css' ;
    }else
    {
        document.getElementById('css').href = '2.css';
    }
}

dis();
</script>